Input torque control system of belt-type continuously variable transmission for vehicle

(19)

(11)

EP 1 582 778 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	18.07.2007 Bulletin 2007/29

(43)	Date of publication A2:
	05.10.2005 Bulletin 2005/40

(21)	Application number: 05251411.4

(22)	Date of filing: 09.03.2005

(51)

International Patent Classification (IPC):

F16H 61/00^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR LV MK YU

(30)

Priority:

31.03.2004 JP 2004108200

(71)	Applicant: JATCO Ltd
	Fuji-shi, Shizuoka 417-8585 (JP)

(72)	Inventors:
	Oshita, Hideki Fuji-shi Shizuoka 417-8585 (JP) Tanaka, Hiroyasu Fuji-shi Shizuoka 417-8585 (JP) Inoue, Takuichiro Fuji-shi Shizuoka 417-8585 (JP) Yamamoto, Masahiro Fuji-shi Shizuoka 417-8585 (JP) Abe, Kousuke Fuji-shi Shizuoka 417-8585 (JP)

(74)	Representative: Baldwin, Mark et al
	R.G.C. Jenkins & Co, 26 Caxton Street London SW1H 0RJ London SW1H 0RJ (GB)

(54)	Input torque control system of belt-type continuously variable transmission for vehicle

(57) A transmission controller commands a demand torque of an engine to an engine controller (19) according to an actual secondary pulley pressure (Psec) that is detected by a secondary pulley pressure sensor (15) when a vehicle speed is 0 km/h and a state wherein gear ratio is equal to or higher than a predetermined gear ratio is continued for a first predetermined time or more. Thereby, since an input torque corresponding to a secondary pulley pressure (Psec) which is actually generated is inputted to a primary pulley even when a failure occurs in the secondary pulley rotation sensor (14), engine performance of a vehicle can be ensured.

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